PWM
The PWM component returns a digital output that is switched high for a period related to the amplitude of a control signal, then switched low for the remainder of a predefined cycle time.
This type of signal is used to control systems that can only be switched on or off, but need more accuracy than an on-off controller (like a thermostat), or where there is a lot of electromagnetic noise. They are also used to limit the time the system is switched on to avoid damage.
Typical applications include microwave ovens, industrial furnaces and many automotive control applications. This block uses the Limited PID block to determine the “Control Time”, that is, the time during which the signal is switched “on”. The Cycle Limit determines the maximum allowed time before the signal is switched off, usually expressed as a fraction of the Cycle Time. |
|
